| /* |
| * super.c |
| * |
| * PURPOSE |
| * Super block routines for the OSTA-UDF(tm) filesystem. |
| * |
| * DESCRIPTION |
| * OSTA-UDF(tm) = Optical Storage Technology Association |
| * Universal Disk Format. |
| * |
| * This code is based on version 2.00 of the UDF specification, |
| * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346]. |
| * http://www.osta.org/ |
| * http://www.ecma.ch/ |
| * http://www.iso.org/ |
| * |
| * COPYRIGHT |
| * This file is distributed under the terms of the GNU General Public |
| * License (GPL). Copies of the GPL can be obtained from: |
| * ftp://prep.ai.mit.edu/pub/gnu/GPL |
| * Each contributing author retains all rights to their own work. |
| * |
| * (C) 1998 Dave Boynton |
| * (C) 1998-2004 Ben Fennema |
| * (C) 2000 Stelias Computing Inc |
| * |
| * HISTORY |
| * |
| * 09/24/98 dgb changed to allow compiling outside of kernel, and |
| * added some debugging. |
| * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34 |
| * 10/16/98 attempting some multi-session support |
| * 10/17/98 added freespace count for "df" |
| * 11/11/98 gr added novrs option |
| * 11/26/98 dgb added fileset,anchor mount options |
| * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced |
| * vol descs. rewrote option handling based on isofs |
| * 12/20/98 find the free space bitmap (if it exists) |
| */ |
| |
| #include "udfdecl.h" |
| |
| #include <linux/blkdev.h> |
| #include <linux/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/parser.h> |
| #include <linux/stat.h> |
| #include <linux/cdrom.h> |
| #include <linux/nls.h> |
| #include <linux/smp_lock.h> |
| #include <linux/buffer_head.h> |
| #include <linux/vfs.h> |
| #include <linux/vmalloc.h> |
| #include <asm/byteorder.h> |
| |
| #include <linux/udf_fs.h> |
| #include "udf_sb.h" |
| #include "udf_i.h" |
| |
| #include <linux/init.h> |
| #include <asm/uaccess.h> |
| |
| #define VDS_POS_PRIMARY_VOL_DESC 0 |
| #define VDS_POS_UNALLOC_SPACE_DESC 1 |
| #define VDS_POS_LOGICAL_VOL_DESC 2 |
| #define VDS_POS_PARTITION_DESC 3 |
| #define VDS_POS_IMP_USE_VOL_DESC 4 |
| #define VDS_POS_VOL_DESC_PTR 5 |
| #define VDS_POS_TERMINATING_DESC 6 |
| #define VDS_POS_LENGTH 7 |
| |
| static char error_buf[1024]; |
| |
| /* These are the "meat" - everything else is stuffing */ |
| static int udf_fill_super(struct super_block *, void *, int); |
| static void udf_put_super(struct super_block *); |
| static void udf_write_super(struct super_block *); |
| static int udf_remount_fs(struct super_block *, int *, char *); |
| static int udf_check_valid(struct super_block *, int, int); |
| static int udf_vrs(struct super_block *sb, int silent); |
| static int udf_load_partition(struct super_block *, kernel_lb_addr *); |
| static int udf_load_logicalvol(struct super_block *, struct buffer_head *, |
| kernel_lb_addr *); |
| static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad); |
| static void udf_find_anchor(struct super_block *); |
| static int udf_find_fileset(struct super_block *, kernel_lb_addr *, |
| kernel_lb_addr *); |
| static void udf_load_pvoldesc(struct super_block *, struct buffer_head *); |
| static void udf_load_fileset(struct super_block *, struct buffer_head *, |
| kernel_lb_addr *); |
| static int udf_load_partdesc(struct super_block *, struct buffer_head *); |
| static void udf_open_lvid(struct super_block *); |
| static void udf_close_lvid(struct super_block *); |
| static unsigned int udf_count_free(struct super_block *); |
| static int udf_statfs(struct dentry *, struct kstatfs *); |
| |
| /* UDF filesystem type */ |
| static int udf_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, |
| struct vfsmount *mnt) |
| { |
| return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt); |
| } |
| |
| static struct file_system_type udf_fstype = { |
| .owner = THIS_MODULE, |
| .name = "udf", |
| .get_sb = udf_get_sb, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| |
| static struct kmem_cache *udf_inode_cachep; |
| |
| static struct inode *udf_alloc_inode(struct super_block *sb) |
| { |
| struct udf_inode_info *ei; |
| ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL); |
| if (!ei) |
| return NULL; |
| |
| ei->i_unique = 0; |
| ei->i_lenExtents = 0; |
| ei->i_next_alloc_block = 0; |
| ei->i_next_alloc_goal = 0; |
| ei->i_strat4096 = 0; |
| |
| return &ei->vfs_inode; |
| } |
| |
| static void udf_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(udf_inode_cachep, UDF_I(inode)); |
| } |
| |
| static void init_once(struct kmem_cache *cachep, void *foo) |
| { |
| struct udf_inode_info *ei = (struct udf_inode_info *)foo; |
| |
| ei->i_ext.i_data = NULL; |
| inode_init_once(&ei->vfs_inode); |
| } |
| |
| static int init_inodecache(void) |
| { |
| udf_inode_cachep = kmem_cache_create("udf_inode_cache", |
| sizeof(struct udf_inode_info), |
| 0, (SLAB_RECLAIM_ACCOUNT | |
| SLAB_MEM_SPREAD), |
| init_once); |
| if (!udf_inode_cachep) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void destroy_inodecache(void) |
| { |
| kmem_cache_destroy(udf_inode_cachep); |
| } |
| |
| /* Superblock operations */ |
| static const struct super_operations udf_sb_ops = { |
| .alloc_inode = udf_alloc_inode, |
| .destroy_inode = udf_destroy_inode, |
| .write_inode = udf_write_inode, |
| .delete_inode = udf_delete_inode, |
| .clear_inode = udf_clear_inode, |
| .put_super = udf_put_super, |
| .write_super = udf_write_super, |
| .statfs = udf_statfs, |
| .remount_fs = udf_remount_fs, |
| }; |
| |
| struct udf_options { |
| unsigned char novrs; |
| unsigned int blocksize; |
| unsigned int session; |
| unsigned int lastblock; |
| unsigned int anchor; |
| unsigned int volume; |
| unsigned short partition; |
| unsigned int fileset; |
| unsigned int rootdir; |
| unsigned int flags; |
| mode_t umask; |
| gid_t gid; |
| uid_t uid; |
| struct nls_table *nls_map; |
| }; |
| |
| static int __init init_udf_fs(void) |
| { |
| int err; |
| |
| err = init_inodecache(); |
| if (err) |
| goto out1; |
| err = register_filesystem(&udf_fstype); |
| if (err) |
| goto out; |
| |
| return 0; |
| |
| out: |
| destroy_inodecache(); |
| |
| out1: |
| return err; |
| } |
| |
| static void __exit exit_udf_fs(void) |
| { |
| unregister_filesystem(&udf_fstype); |
| destroy_inodecache(); |
| } |
| |
| module_init(init_udf_fs) |
| module_exit(exit_udf_fs) |
| |
| /* |
| * udf_parse_options |
| * |
| * PURPOSE |
| * Parse mount options. |
| * |
| * DESCRIPTION |
| * The following mount options are supported: |
| * |
| * gid= Set the default group. |
| * umask= Set the default umask. |
| * uid= Set the default user. |
| * bs= Set the block size. |
| * unhide Show otherwise hidden files. |
| * undelete Show deleted files in lists. |
| * adinicb Embed data in the inode (default) |
| * noadinicb Don't embed data in the inode |
| * shortad Use short ad's |
| * longad Use long ad's (default) |
| * nostrict Unset strict conformance |
| * iocharset= Set the NLS character set |
| * |
| * The remaining are for debugging and disaster recovery: |
| * |
| * novrs Skip volume sequence recognition |
| * |
| * The following expect a offset from 0. |
| * |
| * session= Set the CDROM session (default= last session) |
| * anchor= Override standard anchor location. (default= 256) |
| * volume= Override the VolumeDesc location. (unused) |
| * partition= Override the PartitionDesc location. (unused) |
| * lastblock= Set the last block of the filesystem/ |
| * |
| * The following expect a offset from the partition root. |
| * |
| * fileset= Override the fileset block location. (unused) |
| * rootdir= Override the root directory location. (unused) |
| * WARNING: overriding the rootdir to a non-directory may |
| * yield highly unpredictable results. |
| * |
| * PRE-CONDITIONS |
| * options Pointer to mount options string. |
| * uopts Pointer to mount options variable. |
| * |
| * POST-CONDITIONS |
| * <return> 1 Mount options parsed okay. |
| * <return> 0 Error parsing mount options. |
| * |
| * HISTORY |
| * July 1, 1997 - Andrew E. Mileski |
| * Written, tested, and released. |
| */ |
| |
| enum { |
| Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete, |
| Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad, |
| Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock, |
| Opt_anchor, Opt_volume, Opt_partition, Opt_fileset, |
| Opt_rootdir, Opt_utf8, Opt_iocharset, |
| Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore |
| }; |
| |
| static match_table_t tokens = { |
| {Opt_novrs, "novrs"}, |
| {Opt_nostrict, "nostrict"}, |
| {Opt_bs, "bs=%u"}, |
| {Opt_unhide, "unhide"}, |
| {Opt_undelete, "undelete"}, |
| {Opt_noadinicb, "noadinicb"}, |
| {Opt_adinicb, "adinicb"}, |
| {Opt_shortad, "shortad"}, |
| {Opt_longad, "longad"}, |
| {Opt_uforget, "uid=forget"}, |
| {Opt_uignore, "uid=ignore"}, |
| {Opt_gforget, "gid=forget"}, |
| {Opt_gignore, "gid=ignore"}, |
| {Opt_gid, "gid=%u"}, |
| {Opt_uid, "uid=%u"}, |
| {Opt_umask, "umask=%o"}, |
| {Opt_session, "session=%u"}, |
| {Opt_lastblock, "lastblock=%u"}, |
| {Opt_anchor, "anchor=%u"}, |
| {Opt_volume, "volume=%u"}, |
| {Opt_partition, "partition=%u"}, |
| {Opt_fileset, "fileset=%u"}, |
| {Opt_rootdir, "rootdir=%u"}, |
| {Opt_utf8, "utf8"}, |
| {Opt_iocharset, "iocharset=%s"}, |
| {Opt_err, NULL} |
| }; |
| |
| static int udf_parse_options(char *options, struct udf_options *uopt) |
| { |
| char *p; |
| int option; |
| |
| uopt->novrs = 0; |
| uopt->blocksize = 2048; |
| uopt->partition = 0xFFFF; |
| uopt->session = 0xFFFFFFFF; |
| uopt->lastblock = 0; |
| uopt->anchor = 0; |
| uopt->volume = 0xFFFFFFFF; |
| uopt->rootdir = 0xFFFFFFFF; |
| uopt->fileset = 0xFFFFFFFF; |
| uopt->nls_map = NULL; |
| |
| if (!options) |
| return 1; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| substring_t args[MAX_OPT_ARGS]; |
| int token; |
| if (!*p) |
| continue; |
| |
| token = match_token(p, tokens, args); |
| switch (token) { |
| case Opt_novrs: |
| uopt->novrs = 1; |
| case Opt_bs: |
| if (match_int(&args[0], &option)) |
| return 0; |
| uopt->blocksize = option; |
| break; |
| case Opt_unhide: |
| uopt->flags |= (1 << UDF_FLAG_UNHIDE); |
| break; |
| case Opt_undelete: |
| uopt->flags |= (1 << UDF_FLAG_UNDELETE); |
| break; |
| case Opt_noadinicb: |
| uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB); |
| break; |
| case Opt_adinicb: |
| uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB); |
| break; |
| case Opt_shortad: |
| uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD); |
| break; |
| case Opt_longad: |
| uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD); |
| break; |
| case Opt_gid: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->gid = option; |
| uopt->flags |= (1 << UDF_FLAG_GID_SET); |
| break; |
| case Opt_uid: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->uid = option; |
| uopt->flags |= (1 << UDF_FLAG_UID_SET); |
| break; |
| case Opt_umask: |
| if (match_octal(args, &option)) |
| return 0; |
| uopt->umask = option; |
| break; |
| case Opt_nostrict: |
| uopt->flags &= ~(1 << UDF_FLAG_STRICT); |
| break; |
| case Opt_session: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->session = option; |
| break; |
| case Opt_lastblock: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->lastblock = option; |
| break; |
| case Opt_anchor: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->anchor = option; |
| break; |
| case Opt_volume: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->volume = option; |
| break; |
| case Opt_partition: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->partition = option; |
| break; |
| case Opt_fileset: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->fileset = option; |
| break; |
| case Opt_rootdir: |
| if (match_int(args, &option)) |
| return 0; |
| uopt->rootdir = option; |
| break; |
| case Opt_utf8: |
| uopt->flags |= (1 << UDF_FLAG_UTF8); |
| break; |
| #ifdef CONFIG_UDF_NLS |
| case Opt_iocharset: |
| uopt->nls_map = load_nls(args[0].from); |
| uopt->flags |= (1 << UDF_FLAG_NLS_MAP); |
| break; |
| #endif |
| case Opt_uignore: |
| uopt->flags |= (1 << UDF_FLAG_UID_IGNORE); |
| break; |
| case Opt_uforget: |
| uopt->flags |= (1 << UDF_FLAG_UID_FORGET); |
| break; |
| case Opt_gignore: |
| uopt->flags |= (1 << UDF_FLAG_GID_IGNORE); |
| break; |
| case Opt_gforget: |
| uopt->flags |= (1 << UDF_FLAG_GID_FORGET); |
| break; |
| default: |
| printk(KERN_ERR "udf: bad mount option \"%s\" " |
| "or missing value\n", p); |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| void udf_write_super(struct super_block *sb) |
| { |
| lock_kernel(); |
| |
| if (!(sb->s_flags & MS_RDONLY)) |
| udf_open_lvid(sb); |
| sb->s_dirt = 0; |
| |
| unlock_kernel(); |
| } |
| |
| static int udf_remount_fs(struct super_block *sb, int *flags, char *options) |
| { |
| struct udf_options uopt; |
| |
| uopt.flags = UDF_SB(sb)->s_flags; |
| uopt.uid = UDF_SB(sb)->s_uid; |
| uopt.gid = UDF_SB(sb)->s_gid; |
| uopt.umask = UDF_SB(sb)->s_umask; |
| |
| if (!udf_parse_options(options, &uopt)) |
| return -EINVAL; |
| |
| UDF_SB(sb)->s_flags = uopt.flags; |
| UDF_SB(sb)->s_uid = uopt.uid; |
| UDF_SB(sb)->s_gid = uopt.gid; |
| UDF_SB(sb)->s_umask = uopt.umask; |
| |
| if (UDF_SB_LVIDBH(sb)) { |
| int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev); |
| if (write_rev > UDF_MAX_WRITE_VERSION) |
| *flags |= MS_RDONLY; |
| } |
| |
| if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| return 0; |
| if (*flags & MS_RDONLY) |
| udf_close_lvid(sb); |
| else |
| udf_open_lvid(sb); |
| |
| return 0; |
| } |
| |
| /* |
| * udf_set_blocksize |
| * |
| * PURPOSE |
| * Set the block size to be used in all transfers. |
| * |
| * DESCRIPTION |
| * To allow room for a DMA transfer, it is best to guess big when unsure. |
| * This routine picks 2048 bytes as the blocksize when guessing. This |
| * should be adequate until devices with larger block sizes become common. |
| * |
| * Note that the Linux kernel can currently only deal with blocksizes of |
| * 512, 1024, 2048, 4096, and 8192 bytes. |
| * |
| * PRE-CONDITIONS |
| * sb Pointer to _locked_ superblock. |
| * |
| * POST-CONDITIONS |
| * sb->s_blocksize Blocksize. |
| * sb->s_blocksize_bits log2 of blocksize. |
| * <return> 0 Blocksize is valid. |
| * <return> 1 Blocksize is invalid. |
| * |
| * HISTORY |
| * July 1, 1997 - Andrew E. Mileski |
| * Written, tested, and released. |
| */ |
| static int udf_set_blocksize(struct super_block *sb, int bsize) |
| { |
| if (!sb_min_blocksize(sb, bsize)) { |
| udf_debug("Bad block size (%d)\n", bsize); |
| printk(KERN_ERR "udf: bad block size (%d)\n", bsize); |
| return 0; |
| } |
| |
| return sb->s_blocksize; |
| } |
| |
| static int udf_vrs(struct super_block *sb, int silent) |
| { |
| struct volStructDesc *vsd = NULL; |
| int sector = 32768; |
| int sectorsize; |
| struct buffer_head *bh = NULL; |
| int iso9660 = 0; |
| int nsr02 = 0; |
| int nsr03 = 0; |
| |
| /* Block size must be a multiple of 512 */ |
| if (sb->s_blocksize & 511) |
| return 0; |
| |
| if (sb->s_blocksize < sizeof(struct volStructDesc)) |
| sectorsize = sizeof(struct volStructDesc); |
| else |
| sectorsize = sb->s_blocksize; |
| |
| sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits); |
| |
| udf_debug("Starting at sector %u (%ld byte sectors)\n", |
| (sector >> sb->s_blocksize_bits), sb->s_blocksize); |
| /* Process the sequence (if applicable) */ |
| for (; !nsr02 && !nsr03; sector += sectorsize) { |
| /* Read a block */ |
| bh = udf_tread(sb, sector >> sb->s_blocksize_bits); |
| if (!bh) |
| break; |
| |
| /* Look for ISO descriptors */ |
| vsd = (struct volStructDesc *)(bh->b_data + |
| (sector & (sb->s_blocksize - 1))); |
| |
| if (vsd->stdIdent[0] == 0) { |
| brelse(bh); |
| break; |
| } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, |
| VSD_STD_ID_LEN)) { |
| iso9660 = sector; |
| switch (vsd->structType) { |
| case 0: |
| udf_debug("ISO9660 Boot Record found\n"); |
| break; |
| case 1: |
| udf_debug("ISO9660 Primary Volume Descriptor " |
| "found\n"); |
| break; |
| case 2: |
| udf_debug("ISO9660 Supplementary Volume " |
| "Descriptor found\n"); |
| break; |
| case 3: |
| udf_debug("ISO9660 Volume Partition Descriptor " |
| "found\n"); |
| break; |
| case 255: |
| udf_debug("ISO9660 Volume Descriptor Set " |
| "Terminator found\n"); |
| break; |
| default: |
| udf_debug("ISO9660 VRS (%u) found\n", |
| vsd->structType); |
| break; |
| } |
| } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, |
| VSD_STD_ID_LEN)) |
| ; /* nothing */ |
| else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, |
| VSD_STD_ID_LEN)) { |
| brelse(bh); |
| break; |
| } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, |
| VSD_STD_ID_LEN)) |
| nsr02 = sector; |
| else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, |
| VSD_STD_ID_LEN)) |
| nsr03 = sector; |
| brelse(bh); |
| } |
| |
| if (nsr03) |
| return nsr03; |
| else if (nsr02) |
| return nsr02; |
| else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768) |
| return -1; |
| else |
| return 0; |
| } |
| |
| /* |
| * udf_find_anchor |
| * |
| * PURPOSE |
| * Find an anchor volume descriptor. |
| * |
| * PRE-CONDITIONS |
| * sb Pointer to _locked_ superblock. |
| * lastblock Last block on media. |
| * |
| * POST-CONDITIONS |
| * <return> 1 if not found, 0 if ok |
| * |
| * HISTORY |
| * July 1, 1997 - Andrew E. Mileski |
| * Written, tested, and released. |
| */ |
| static void udf_find_anchor(struct super_block *sb) |
| { |
| int lastblock = UDF_SB_LASTBLOCK(sb); |
| struct buffer_head *bh = NULL; |
| uint16_t ident; |
| uint32_t location; |
| int i; |
| |
| if (lastblock) { |
| int varlastblock = udf_variable_to_fixed(lastblock); |
| int last[] = { lastblock, lastblock - 2, |
| lastblock - 150, lastblock - 152, |
| varlastblock, varlastblock - 2, |
| varlastblock - 150, varlastblock - 152 }; |
| |
| lastblock = 0; |
| |
| /* Search for an anchor volume descriptor pointer */ |
| |
| /* according to spec, anchor is in either: |
| * block 256 |
| * lastblock-256 |
| * lastblock |
| * however, if the disc isn't closed, it could be 512 */ |
| |
| for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) { |
| ident = location = 0; |
| if (last[i] >= 0) { |
| bh = sb_bread(sb, last[i]); |
| if (bh) { |
| tag *t = (tag *)bh->b_data; |
| ident = le16_to_cpu(t->tagIdent); |
| location = le32_to_cpu(t->tagLocation); |
| brelse(bh); |
| } |
| } |
| |
| if (ident == TAG_IDENT_AVDP) { |
| if (location == last[i] - UDF_SB_SESSION(sb)) { |
| lastblock = last[i] - UDF_SB_SESSION(sb); |
| UDF_SB_ANCHOR(sb)[0] = lastblock; |
| UDF_SB_ANCHOR(sb)[1] = lastblock - 256; |
| } else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb)) { |
| UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); |
| lastblock = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb); |
| UDF_SB_ANCHOR(sb)[0] = lastblock; |
| UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb); |
| } else { |
| udf_debug("Anchor found at block %d, location mismatch %d.\n", |
| last[i], location); |
| } |
| } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) { |
| lastblock = last[i]; |
| UDF_SB_ANCHOR(sb)[3] = 512; |
| } else { |
| ident = location = 0; |
| if (last[i] >= 256) { |
| bh = sb_bread(sb, last[i] - 256); |
| if (bh) { |
| tag *t = (tag *)bh->b_data; |
| ident = le16_to_cpu(t->tagIdent); |
| location = le32_to_cpu(t->tagLocation); |
| brelse(bh); |
| } |
| } |
| |
| if (ident == TAG_IDENT_AVDP && |
| location == last[i] - 256 - UDF_SB_SESSION(sb)) { |
| lastblock = last[i]; |
| UDF_SB_ANCHOR(sb)[1] = last[i] - 256; |
| } else { |
| ident = location = 0; |
| if (last[i] >= 312 + UDF_SB_SESSION(sb)) { |
| bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb)); |
| if (bh) { |
| tag *t = (tag *)bh->b_data; |
| ident = le16_to_cpu(t->tagIdent); |
| location = le32_to_cpu(t->tagLocation); |
| brelse(bh); |
| } |
| } |
| |
| if (ident == TAG_IDENT_AVDP && |
| location == udf_variable_to_fixed(last[i]) - 256) { |
| UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); |
| lastblock = udf_variable_to_fixed(last[i]); |
| UDF_SB_ANCHOR(sb)[1] = lastblock - 256; |
| } |
| } |
| } |
| } |
| } |
| |
| if (!lastblock) { |
| /* We haven't found the lastblock. check 312 */ |
| bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb)); |
| if (bh) { |
| tag *t = (tag *)bh->b_data; |
| ident = le16_to_cpu(t->tagIdent); |
| location = le32_to_cpu(t->tagLocation); |
| brelse(bh); |
| |
| if (ident == TAG_IDENT_AVDP && location == 256) |
| UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); |
| } |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) { |
| if (UDF_SB_ANCHOR(sb)[i]) { |
| bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i], |
| UDF_SB_ANCHOR(sb)[i], &ident); |
| if (!bh) |
| UDF_SB_ANCHOR(sb)[i] = 0; |
| else { |
| brelse(bh); |
| if ((ident != TAG_IDENT_AVDP) && |
| (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE))) |
| UDF_SB_ANCHOR(sb)[i] = 0; |
| } |
| } |
| } |
| |
| UDF_SB_LASTBLOCK(sb) = lastblock; |
| } |
| |
| static int udf_find_fileset(struct super_block *sb, |
| kernel_lb_addr *fileset, |
| kernel_lb_addr *root) |
| { |
| struct buffer_head *bh = NULL; |
| long lastblock; |
| uint16_t ident; |
| |
| if (fileset->logicalBlockNum != 0xFFFFFFFF || |
| fileset->partitionReferenceNum != 0xFFFF) { |
| bh = udf_read_ptagged(sb, *fileset, 0, &ident); |
| |
| if (!bh) { |
| return 1; |
| } else if (ident != TAG_IDENT_FSD) { |
| brelse(bh); |
| return 1; |
| } |
| |
| } |
| |
| if (!bh) { |
| /* Search backwards through the partitions */ |
| kernel_lb_addr newfileset; |
| |
| /* --> cvg: FIXME - is it reasonable? */ |
| return 1; |
| |
| for (newfileset.partitionReferenceNum = UDF_SB_NUMPARTS(sb) - 1; |
| (newfileset.partitionReferenceNum != 0xFFFF && |
| fileset->logicalBlockNum == 0xFFFFFFFF && |
| fileset->partitionReferenceNum == 0xFFFF); |
| newfileset.partitionReferenceNum--) { |
| lastblock = UDF_SB_PARTLEN(sb, |
| newfileset.partitionReferenceNum); |
| newfileset.logicalBlockNum = 0; |
| |
| do { |
| bh = udf_read_ptagged(sb, newfileset, 0, |
| &ident); |
| if (!bh) { |
| newfileset.logicalBlockNum++; |
| continue; |
| } |
| |
| switch (ident) { |
| case TAG_IDENT_SBD: |
| { |
| struct spaceBitmapDesc *sp; |
| sp = (struct spaceBitmapDesc *)bh->b_data; |
| newfileset.logicalBlockNum += 1 + |
| ((le32_to_cpu(sp->numOfBytes) + |
| sizeof(struct spaceBitmapDesc) - 1) |
| >> sb->s_blocksize_bits); |
| brelse(bh); |
| break; |
| } |
| case TAG_IDENT_FSD: |
| *fileset = newfileset; |
| break; |
| default: |
| newfileset.logicalBlockNum++; |
| brelse(bh); |
| bh = NULL; |
| break; |
| } |
| } while (newfileset.logicalBlockNum < lastblock && |
| fileset->logicalBlockNum == 0xFFFFFFFF && |
| fileset->partitionReferenceNum == 0xFFFF); |
| } |
| } |
| |
| if ((fileset->logicalBlockNum != 0xFFFFFFFF || |
| fileset->partitionReferenceNum != 0xFFFF) && bh) { |
| udf_debug("Fileset at block=%d, partition=%d\n", |
| fileset->logicalBlockNum, |
| fileset->partitionReferenceNum); |
| |
| UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum; |
| udf_load_fileset(sb, bh, root); |
| brelse(bh); |
| return 0; |
| } |
| return 1; |
| } |
| |
| static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh) |
| { |
| struct primaryVolDesc *pvoldesc; |
| time_t recording; |
| long recording_usec; |
| struct ustr instr; |
| struct ustr outstr; |
| |
| pvoldesc = (struct primaryVolDesc *)bh->b_data; |
| |
| if (udf_stamp_to_time(&recording, &recording_usec, |
| lets_to_cpu(pvoldesc->recordingDateAndTime))) { |
| kernel_timestamp ts; |
| ts = lets_to_cpu(pvoldesc->recordingDateAndTime); |
| udf_debug("recording time %ld/%ld, %04u/%02u/%02u" |
| " %02u:%02u (%x)\n", |
| recording, recording_usec, |
| ts.year, ts.month, ts.day, ts.hour, |
| ts.minute, ts.typeAndTimezone); |
| UDF_SB_RECORDTIME(sb).tv_sec = recording; |
| UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000; |
| } |
| |
| if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) { |
| if (udf_CS0toUTF8(&outstr, &instr)) { |
| strncpy(UDF_SB_VOLIDENT(sb), outstr.u_name, |
| outstr.u_len > 31 ? 31 : outstr.u_len); |
| udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb)); |
| } |
| } |
| |
| if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) { |
| if (udf_CS0toUTF8(&outstr, &instr)) |
| udf_debug("volSetIdent[] = '%s'\n", outstr.u_name); |
| } |
| } |
| |
| static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh, |
| kernel_lb_addr *root) |
| { |
| struct fileSetDesc *fset; |
| |
| fset = (struct fileSetDesc *)bh->b_data; |
| |
| *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation); |
| |
| UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum); |
| |
| udf_debug("Rootdir at block=%d, partition=%d\n", |
| root->logicalBlockNum, root->partitionReferenceNum); |
| } |
| |
| static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh) |
| { |
| struct partitionDesc *p; |
| int i; |
| |
| p = (struct partitionDesc *)bh->b_data; |
| |
| for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) { |
| udf_debug("Searching map: (%d == %d)\n", |
| UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber)); |
| if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber)) { |
| UDF_SB_PARTLEN(sb, i) = le32_to_cpu(p->partitionLength); /* blocks */ |
| UDF_SB_PARTROOT(sb, i) = le32_to_cpu(p->partitionStartingLocation); |
| if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY) |
| UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_READ_ONLY; |
| if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE) |
| UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_WRITE_ONCE; |
| if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE) |
| UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_REWRITABLE; |
| if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE) |
| UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_OVERWRITABLE; |
| |
| if (!strcmp(p->partitionContents.ident, |
| PD_PARTITION_CONTENTS_NSR02) || |
| !strcmp(p->partitionContents.ident, |
| PD_PARTITION_CONTENTS_NSR03)) { |
| struct partitionHeaderDesc *phd; |
| |
| phd = (struct partitionHeaderDesc *)(p->partitionContentsUse); |
| if (phd->unallocSpaceTable.extLength) { |
| kernel_lb_addr loc = { |
| .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition), |
| .partitionReferenceNum = i, |
| }; |
| |
| UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table = |
| udf_iget(sb, loc); |
| if (!UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table) { |
| udf_debug("cannot load unallocSpaceTable (part %d)\n", i); |
| return 1; |
| } |
| UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_UNALLOC_TABLE; |
| udf_debug("unallocSpaceTable (part %d) @ %ld\n", |
| i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino); |
| } |
| if (phd->unallocSpaceBitmap.extLength) { |
| UDF_SB_ALLOC_BITMAP(sb, i, s_uspace); |
| if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL) { |
| UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength = |
| le32_to_cpu(phd->unallocSpaceBitmap.extLength); |
| UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition = |
| le32_to_cpu(phd->unallocSpaceBitmap.extPosition); |
| UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_UNALLOC_BITMAP; |
| udf_debug("unallocSpaceBitmap (part %d) @ %d\n", |
| i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition); |
| } |
| } |
| if (phd->partitionIntegrityTable.extLength) |
| udf_debug("partitionIntegrityTable (part %d)\n", i); |
| if (phd->freedSpaceTable.extLength) { |
| kernel_lb_addr loc = { |
| .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition), |
| .partitionReferenceNum = i, |
| }; |
| |
| UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table = |
| udf_iget(sb, loc); |
| if (!UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table) { |
| udf_debug("cannot load freedSpaceTable (part %d)\n", i); |
| return 1; |
| } |
| UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_FREED_TABLE; |
| udf_debug("freedSpaceTable (part %d) @ %ld\n", |
| i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino); |
| } |
| if (phd->freedSpaceBitmap.extLength) { |
| UDF_SB_ALLOC_BITMAP(sb, i, s_fspace); |
| if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL) { |
| UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength = |
| le32_to_cpu(phd->freedSpaceBitmap.extLength); |
| UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition = |
| le32_to_cpu(phd->freedSpaceBitmap.extPosition); |
| UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_FREED_BITMAP; |
| udf_debug("freedSpaceBitmap (part %d) @ %d\n", |
| i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition); |
| } |
| } |
| } |
| break; |
| } |
| } |
| if (i == UDF_SB_NUMPARTS(sb)) { |
| udf_debug("Partition (%d) not found in partition map\n", |
| le16_to_cpu(p->partitionNumber)); |
| } else { |
| udf_debug("Partition (%d:%d type %x) starts at physical %d, " |
| "block length %d\n", |
| le16_to_cpu(p->partitionNumber), i, |
| UDF_SB_PARTTYPE(sb, i), UDF_SB_PARTROOT(sb, i), |
| UDF_SB_PARTLEN(sb, i)); |
| } |
| return 0; |
| } |
| |
| static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh, |
| kernel_lb_addr *fileset) |
| { |
| struct logicalVolDesc *lvd; |
| int i, j, offset; |
| uint8_t type; |
| |
| lvd = (struct logicalVolDesc *)bh->b_data; |
| |
| UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps)); |
| |
| for (i = 0, offset = 0; |
| i < UDF_SB_NUMPARTS(sb) && offset < le32_to_cpu(lvd->mapTableLength); |
| i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) { |
| type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType; |
| if (type == 1) { |
| struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]); |
| UDF_SB_PARTTYPE(sb, i) = UDF_TYPE1_MAP15; |
| UDF_SB_PARTVSN(sb, i) = le16_to_cpu(gpm1->volSeqNum); |
| UDF_SB_PARTNUM(sb, i) = le16_to_cpu(gpm1->partitionNum); |
| UDF_SB_PARTFUNC(sb, i) = NULL; |
| } else if (type == 2) { |
| struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]); |
| if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) { |
| if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) { |
| UDF_SB_PARTTYPE(sb, i) = UDF_VIRTUAL_MAP15; |
| UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_virt15; |
| } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) { |
| UDF_SB_PARTTYPE(sb, i) = UDF_VIRTUAL_MAP20; |
| UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_virt20; |
| } |
| } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) { |
| uint32_t loc; |
| uint16_t ident; |
| struct sparingTable *st; |
| struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]); |
| |
| UDF_SB_PARTTYPE(sb, i) = UDF_SPARABLE_MAP15; |
| UDF_SB_TYPESPAR(sb, i).s_packet_len = le16_to_cpu(spm->packetLength); |
| for (j = 0; j < spm->numSparingTables; j++) { |
| loc = le32_to_cpu(spm->locSparingTable[j]); |
| UDF_SB_TYPESPAR(sb, i).s_spar_map[j] = |
| udf_read_tagged(sb, loc, loc, &ident); |
| if (UDF_SB_TYPESPAR(sb, i).s_spar_map[j] != NULL) { |
| st = (struct sparingTable *)UDF_SB_TYPESPAR(sb, i).s_spar_map[j]->b_data; |
| if (ident != 0 || |
| strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) { |
| brelse(UDF_SB_TYPESPAR(sb, i).s_spar_map[j]); |
| UDF_SB_TYPESPAR(sb, i).s_spar_map[j] = NULL; |
| } |
| } |
| } |
| UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_spar15; |
| } else { |
| udf_debug("Unknown ident: %s\n", |
| upm2->partIdent.ident); |
| continue; |
| } |
| UDF_SB_PARTVSN(sb, i) = le16_to_cpu(upm2->volSeqNum); |
| UDF_SB_PARTNUM(sb, i) = le16_to_cpu(upm2->partitionNum); |
| } |
| udf_debug("Partition (%d:%d) type %d on volume %d\n", |
| i, UDF_SB_PARTNUM(sb, i), type, |
| UDF_SB_PARTVSN(sb, i)); |
| } |
| |
| if (fileset) { |
| long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]); |
| |
| *fileset = lelb_to_cpu(la->extLocation); |
| udf_debug("FileSet found in LogicalVolDesc at block=%d, " |
| "partition=%d\n", fileset->logicalBlockNum, |
| fileset->partitionReferenceNum); |
| } |
| if (lvd->integritySeqExt.extLength) |
| udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt)); |
| |
| return 0; |
| } |
| |
| /* |
| * udf_load_logicalvolint |
| * |
| */ |
| static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc) |
| { |
| struct buffer_head *bh = NULL; |
| uint16_t ident; |
| |
| while (loc.extLength > 0 && |
| (bh = udf_read_tagged(sb, loc.extLocation, |
| loc.extLocation, &ident)) && |
| ident == TAG_IDENT_LVID) { |
| UDF_SB_LVIDBH(sb) = bh; |
| |
| if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength) |
| udf_load_logicalvolint(sb, |
| leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt)); |
| |
| if (UDF_SB_LVIDBH(sb) != bh) |
| brelse(bh); |
| loc.extLength -= sb->s_blocksize; |
| loc.extLocation++; |
| } |
| if (UDF_SB_LVIDBH(sb) != bh) |
| brelse(bh); |
| } |
| |
| /* |
| * udf_process_sequence |
| * |
| * PURPOSE |
| * Process a main/reserve volume descriptor sequence. |
| * |
| * PRE-CONDITIONS |
| * sb Pointer to _locked_ superblock. |
| * block First block of first extent of the sequence. |
| * lastblock Lastblock of first extent of the sequence. |
| * |
| * HISTORY |
| * July 1, 1997 - Andrew E. Mileski |
| * Written, tested, and released. |
| */ |
| static int udf_process_sequence(struct super_block *sb, long block, |
| long lastblock, kernel_lb_addr *fileset) |
| { |
| struct buffer_head *bh = NULL; |
| struct udf_vds_record vds[VDS_POS_LENGTH]; |
| struct generic_desc *gd; |
| struct volDescPtr *vdp; |
| int done = 0; |
| int i, j; |
| uint32_t vdsn; |
| uint16_t ident; |
| long next_s = 0, next_e = 0; |
| |
| memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH); |
| |
| /* Read the main descriptor sequence */ |
| for (; (!done && block <= lastblock); block++) { |
| |
| bh = udf_read_tagged(sb, block, block, &ident); |
| if (!bh) |
| break; |
| |
| /* Process each descriptor (ISO 13346 3/8.3-8.4) */ |
| gd = (struct generic_desc *)bh->b_data; |
| vdsn = le32_to_cpu(gd->volDescSeqNum); |
| switch (ident) { |
| case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ |
| if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) { |
| vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn; |
| vds[VDS_POS_PRIMARY_VOL_DESC].block = block; |
| } |
| break; |
| case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */ |
| if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) { |
| vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn; |
| vds[VDS_POS_VOL_DESC_PTR].block = block; |
| |
| vdp = (struct volDescPtr *)bh->b_data; |
| next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation); |
| next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength); |
| next_e = next_e >> sb->s_blocksize_bits; |
| next_e += next_s; |
| } |
| break; |
| case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ |
| if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) { |
| vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn; |
| vds[VDS_POS_IMP_USE_VOL_DESC].block = block; |
| } |
| break; |
| case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ |
| if (!vds[VDS_POS_PARTITION_DESC].block) |
| vds[VDS_POS_PARTITION_DESC].block = block; |
| break; |
| case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ |
| if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) { |
| vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn; |
| vds[VDS_POS_LOGICAL_VOL_DESC].block = block; |
| } |
| break; |
| case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ |
| if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) { |
| vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn; |
| vds[VDS_POS_UNALLOC_SPACE_DESC].block = block; |
| } |
| break; |
| case TAG_IDENT_TD: /* ISO 13346 3/10.9 */ |
| vds[VDS_POS_TERMINATING_DESC].block = block; |
| if (next_e) { |
| block = next_s; |
| lastblock = next_e; |
| next_s = next_e = 0; |
| } else { |
| done = 1; |
| } |
| break; |
| } |
| brelse(bh); |
| } |
| for (i = 0; i < VDS_POS_LENGTH; i++) { |
| if (vds[i].block) { |
| bh = udf_read_tagged(sb, vds[i].block, vds[i].block, |
| &ident); |
| |
| if (i == VDS_POS_PRIMARY_VOL_DESC) { |
| udf_load_pvoldesc(sb, bh); |
| } else if (i == VDS_POS_LOGICAL_VOL_DESC) { |
| udf_load_logicalvol(sb, bh, fileset); |
| } else if (i == VDS_POS_PARTITION_DESC) { |
| struct buffer_head *bh2 = NULL; |
| if (udf_load_partdesc(sb, bh)) { |
| brelse(bh); |
| return 1; |
| } |
| for (j = vds[i].block + 1; |
| j < vds[VDS_POS_TERMINATING_DESC].block; |
| j++) { |
| bh2 = udf_read_tagged(sb, j, j, &ident); |
| gd = (struct generic_desc *)bh2->b_data; |
| if (ident == TAG_IDENT_PD) |
| if (udf_load_partdesc(sb, |
| bh2)) { |
| brelse(bh); |
| brelse(bh2); |
| return 1; |
| } |
| brelse(bh2); |
| } |
| } |
| brelse(bh); |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * udf_check_valid() |
| */ |
| static int udf_check_valid(struct super_block *sb, int novrs, int silent) |
| { |
| long block; |
| |
| if (novrs) { |
| udf_debug("Validity check skipped because of novrs option\n"); |
| return 0; |
| } |
| /* Check that it is NSR02 compliant */ |
| /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */ |
| else { |
| block = udf_vrs(sb, silent); |
| if (block == -1) { |
| udf_debug("Failed to read byte 32768. Assuming open " |
| "disc. Skipping validity check\n"); |
| if (!UDF_SB_LASTBLOCK(sb)) |
| UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb); |
| return 0; |
| } else |
| return !block; |
| } |
| } |
| |
| static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset) |
| { |
| struct anchorVolDescPtr *anchor; |
| uint16_t ident; |
| struct buffer_head *bh; |
| long main_s, main_e, reserve_s, reserve_e; |
| int i, j; |
| |
| if (!sb) |
| return 1; |
| |
| for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) { |
| if (UDF_SB_ANCHOR(sb)[i] && |
| (bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i], |
| UDF_SB_ANCHOR(sb)[i], &ident))) { |
| anchor = (struct anchorVolDescPtr *)bh->b_data; |
| |
| /* Locate the main sequence */ |
| main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation); |
| main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength); |
| main_e = main_e >> sb->s_blocksize_bits; |
| main_e += main_s; |
| |
| /* Locate the reserve sequence */ |
| reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation); |
| reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength); |
| reserve_e = reserve_e >> sb->s_blocksize_bits; |
| reserve_e += reserve_s; |
| |
| brelse(bh); |
| |
| /* Process the main & reserve sequences */ |
| /* responsible for finding the PartitionDesc(s) */ |
| if (!(udf_process_sequence(sb, main_s, main_e, fileset) && |
| udf_process_sequence(sb, reserve_s, reserve_e, fileset))) |
| break; |
| } |
| } |
| |
| if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) { |
| udf_debug("No Anchor block found\n"); |
| return 1; |
| } else |
| udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]); |
| |
| for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) { |
| kernel_lb_addr uninitialized_var(ino); |
| switch (UDF_SB_PARTTYPE(sb, i)) { |
| case UDF_VIRTUAL_MAP15: |
| case UDF_VIRTUAL_MAP20: |
| if (!UDF_SB_LASTBLOCK(sb)) { |
| UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb); |
| udf_find_anchor(sb); |
| } |
| |
| if (!UDF_SB_LASTBLOCK(sb)) { |
| udf_debug("Unable to determine Lastblock (For " |
| "Virtual Partition)\n"); |
| return 1; |
| } |
| |
| for (j = 0; j < UDF_SB_NUMPARTS(sb); j++) { |
| if (j != i && |
| UDF_SB_PARTVSN(sb, i) == UDF_SB_PARTVSN(sb, j) && |
| UDF_SB_PARTNUM(sb, i) == UDF_SB_PARTNUM(sb, j)) { |
| ino.partitionReferenceNum = j; |
| ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) - UDF_SB_PARTROOT(sb, j); |
| break; |
| } |
| } |
| |
| if (j == UDF_SB_NUMPARTS(sb)) |
| return 1; |
| |
| UDF_SB_VAT(sb) = udf_iget(sb, ino); |
| if (!UDF_SB_VAT(sb)) |
| return 1; |
| |
| if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP15) { |
| UDF_SB_TYPEVIRT(sb, i).s_start_offset = |
| udf_ext0_offset(UDF_SB_VAT(sb)); |
| UDF_SB_TYPEVIRT(sb, i).s_num_entries = |
| (UDF_SB_VAT(sb)->i_size - 36) >> 2; |
| } else if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP20) { |
| struct buffer_head *bh = NULL; |
| uint32_t pos; |
| |
| pos = udf_block_map(UDF_SB_VAT(sb), 0); |
| bh = sb_bread(sb, pos); |
| if (!bh) |
| return 1; |
| UDF_SB_TYPEVIRT(sb, i).s_start_offset = |
| le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + |
| udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) + |
| udf_ext0_offset(UDF_SB_VAT(sb)); |
| UDF_SB_TYPEVIRT(sb, i).s_num_entries = (UDF_SB_VAT(sb)->i_size - |
| UDF_SB_TYPEVIRT(sb, i).s_start_offset) >> 2; |
| brelse(bh); |
| } |
| UDF_SB_PARTROOT(sb, i) = udf_get_pblock(sb, 0, i, 0); |
| UDF_SB_PARTLEN(sb, i) = UDF_SB_PARTLEN(sb, ino.partitionReferenceNum); |
| } |
| } |
| return 0; |
| } |
| |
| static void udf_open_lvid(struct super_block *sb) |
| { |
| if (UDF_SB_LVIDBH(sb)) { |
| int i; |
| kernel_timestamp cpu_time; |
| |
| UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; |
| UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; |
| if (udf_time_to_stamp(&cpu_time, CURRENT_TIME)) |
| UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time); |
| UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN; |
| |
| UDF_SB_LVID(sb)->descTag.descCRC = cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag), |
| le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0)); |
| |
| UDF_SB_LVID(sb)->descTag.tagChecksum = 0; |
| for (i = 0; i < 16; i++) |
| if (i != 4) |
| UDF_SB_LVID(sb)->descTag.tagChecksum += |
| ((uint8_t *) &(UDF_SB_LVID(sb)->descTag))[i]; |
| |
| mark_buffer_dirty(UDF_SB_LVIDBH(sb)); |
| } |
| } |
| |
| static void udf_close_lvid(struct super_block *sb) |
| { |
| kernel_timestamp cpu_time; |
| int i; |
| |
| if (UDF_SB_LVIDBH(sb) && |
| UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN) { |
| UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; |
| UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; |
| if (udf_time_to_stamp(&cpu_time, CURRENT_TIME)) |
| UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time); |
| if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev)) |
| UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); |
| if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev)) |
| UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb)); |
| if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev)) |
| UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb)); |
| UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE); |
| |
| UDF_SB_LVID(sb)->descTag.descCRC = |
| cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag), |
| le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0)); |
| |
| UDF_SB_LVID(sb)->descTag.tagChecksum = 0; |
| for (i = 0; i < 16; i++) |
| if (i != 4) |
| UDF_SB_LVID(sb)->descTag.tagChecksum += |
| ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i]; |
| |
| mark_buffer_dirty(UDF_SB_LVIDBH(sb)); |
| } |
| } |
| |
| /* |
| * udf_read_super |
| * |
| * PURPOSE |
| * Complete the specified super block. |
| * |
| * PRE-CONDITIONS |
| * sb Pointer to superblock to complete - never NULL. |
| * sb->s_dev Device to read suberblock from. |
| * options Pointer to mount options. |
| * silent Silent flag. |
| * |
| * HISTORY |
| * July 1, 1997 - Andrew E. Mileski |
| * Written, tested, and released. |
| */ |
| static int udf_fill_super(struct super_block *sb, void *options, int silent) |
| { |
| int i; |
| struct inode *inode = NULL; |
| struct udf_options uopt; |
| kernel_lb_addr rootdir, fileset; |
| struct udf_sb_info *sbi; |
| |
| uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT); |
| uopt.uid = -1; |
| uopt.gid = -1; |
| uopt.umask = 0; |
| |
| sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL); |
| if (!sbi) |
| return -ENOMEM; |
| |
| sb->s_fs_info = sbi; |
| memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info)); |
| |
| mutex_init(&sbi->s_alloc_mutex); |
| |
| if (!udf_parse_options((char *)options, &uopt)) |
| goto error_out; |
| |
| if (uopt.flags & (1 << UDF_FLAG_UTF8) && |
| uopt.flags & (1 << UDF_FLAG_NLS_MAP)) { |
| udf_error(sb, "udf_read_super", |
| "utf8 cannot be combined with iocharset\n"); |
| goto error_out; |
| } |
| #ifdef CONFIG_UDF_NLS |
| if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) { |
| uopt.nls_map = load_nls_default(); |
| if (!uopt.nls_map) |
| uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP); |
| else |
| udf_debug("Using default NLS map\n"); |
| } |
| #endif |
| if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP))) |
| uopt.flags |= (1 << UDF_FLAG_UTF8); |
| |
| fileset.logicalBlockNum = 0xFFFFFFFF; |
| fileset.partitionReferenceNum = 0xFFFF; |
| |
| UDF_SB(sb)->s_flags = uopt.flags; |
| UDF_SB(sb)->s_uid = uopt.uid; |
| UDF_SB(sb)->s_gid = uopt.gid; |
| UDF_SB(sb)->s_umask = uopt.umask; |
| UDF_SB(sb)->s_nls_map = uopt.nls_map; |
| |
| /* Set the block size for all transfers */ |
| if (!udf_set_blocksize(sb, uopt.blocksize)) |
| goto error_out; |
| |
| if (uopt.session == 0xFFFFFFFF) |
| UDF_SB_SESSION(sb) = udf_get_last_session(sb); |
| else |
| UDF_SB_SESSION(sb) = uopt.session; |
| |
| udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb)); |
| |
| UDF_SB_LASTBLOCK(sb) = uopt.lastblock; |
| UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0; |
| UDF_SB_ANCHOR(sb)[2] = uopt.anchor; |
| UDF_SB_ANCHOR(sb)[3] = 256; |
| |
| if (udf_check_valid(sb, uopt.novrs, silent)) { |
| /* read volume recognition sequences */ |
| printk(KERN_WARNING "UDF-fs: No VRS found\n"); |
| goto error_out; |
| } |
| |
| udf_find_anchor(sb); |
| |
| /* Fill in the rest of the superblock */ |
| sb->s_op = &udf_sb_ops; |
| sb->dq_op = NULL; |
| sb->s_dirt = 0; |
| sb->s_magic = UDF_SUPER_MAGIC; |
| sb->s_time_gran = 1000; |
| |
| if (udf_load_partition(sb, &fileset)) { |
| printk(KERN_WARNING "UDF-fs: No partition found (1)\n"); |
| goto error_out; |
| } |
| |
| udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb)); |
| |
| if (UDF_SB_LVIDBH(sb)) { |
| uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev); |
| uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev); |
| /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */ |
| |
| if (minUDFReadRev > UDF_MAX_READ_VERSION) { |
| printk(KERN_ERR "UDF-fs: minUDFReadRev=%x (max is %x)\n", |
| le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev), |
| UDF_MAX_READ_VERSION); |
| goto error_out; |
| } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) { |
| sb->s_flags |= MS_RDONLY; |
| } |
| |
| UDF_SB_UDFREV(sb) = minUDFWriteRev; |
| |
| if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE) |
| UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE); |
| if (minUDFReadRev >= UDF_VERS_USE_STREAMS) |
| UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS); |
| } |
| |
| if (!UDF_SB_NUMPARTS(sb)) { |
| printk(KERN_WARNING "UDF-fs: No partition found (2)\n"); |
| goto error_out; |
| } |
| |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) { |
| printk(KERN_NOTICE "UDF-fs: Partition marked readonly; forcing readonly mount\n"); |
| sb->s_flags |= MS_RDONLY; |
| } |
| |
| if (udf_find_fileset(sb, &fileset, &rootdir)) { |
| printk(KERN_WARNING "UDF-fs: No fileset found\n"); |
| goto error_out; |
| } |
| |
| if (!silent) { |
| kernel_timestamp ts; |
| udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb)); |
| udf_info("UDF %s (%s) Mounting volume '%s', " |
| "timestamp %04u/%02u/%02u %02u:%02u (%x)\n", |
| UDFFS_VERSION, UDFFS_DATE, |
| UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute, |
| ts.typeAndTimezone); |
| } |
| if (!(sb->s_flags & MS_RDONLY)) |
| udf_open_lvid(sb); |
| |
| /* Assign the root inode */ |
| /* assign inodes by physical block number */ |
| /* perhaps it's not extensible enough, but for now ... */ |
| inode = udf_iget(sb, rootdir); |
| if (!inode) { |
| printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, partition=%d\n", |
| rootdir.logicalBlockNum, rootdir.partitionReferenceNum); |
| goto error_out; |
| } |
| |
| /* Allocate a dentry for the root inode */ |
| sb->s_root = d_alloc_root(inode); |
| if (!sb->s_root) { |
| printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n"); |
| iput(inode); |
| goto error_out; |
| } |
| sb->s_maxbytes = MAX_LFS_FILESIZE; |
| return 0; |
| |
| error_out: |
| if (UDF_SB_VAT(sb)) |
| iput(UDF_SB_VAT(sb)); |
| if (UDF_SB_NUMPARTS(sb)) { |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) |
| iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table); |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) |
| iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table); |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) |
| UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_uspace); |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) |
| UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_fspace); |
| if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) { |
| for (i = 0; i < 4; i++) |
| brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]); |
| } |
| } |
| #ifdef CONFIG_UDF_NLS |
| if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) |
| unload_nls(UDF_SB(sb)->s_nls_map); |
| #endif |
| if (!(sb->s_flags & MS_RDONLY)) |
| udf_close_lvid(sb); |
| brelse(UDF_SB_LVIDBH(sb)); |
| UDF_SB_FREE(sb); |
| kfree(sbi); |
| sb->s_fs_info = NULL; |
| |
| return -EINVAL; |
| } |
| |
| void udf_error(struct super_block *sb, const char *function, |
| const char *fmt, ...) |
| { |
| va_list args; |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| /* mark sb error */ |
| sb->s_dirt = 1; |
| } |
| va_start(args, fmt); |
| vsnprintf(error_buf, sizeof(error_buf), fmt, args); |
| va_end(args); |
| printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n", |
| sb->s_id, function, error_buf); |
| } |
| |
| void udf_warning(struct super_block *sb, const char *function, |
| const char *fmt, ...) |
| { |
| va_list args; |
| |
| va_start(args, fmt); |
| vsnprintf(error_buf, sizeof(error_buf), fmt, args); |
| va_end(args); |
| printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n", |
| sb->s_id, function, error_buf); |
| } |
| |
| /* |
| * udf_put_super |
| * |
| * PURPOSE |
| * Prepare for destruction of the superblock. |
| * |
| * DESCRIPTION |
| * Called before the filesystem is unmounted. |
| * |
| * HISTORY |
| * July 1, 1997 - Andrew E. Mileski |
| * Written, tested, and released. |
| */ |
| static void udf_put_super(struct super_block *sb) |
| { |
| int i; |
| |
| if (UDF_SB_VAT(sb)) |
| iput(UDF_SB_VAT(sb)); |
| if (UDF_SB_NUMPARTS(sb)) { |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) |
| iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table); |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) |
| iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table); |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) |
| UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_uspace); |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) |
| UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_fspace); |
| if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) { |
| for (i = 0; i < 4; i++) |
| brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]); |
| } |
| } |
| #ifdef CONFIG_UDF_NLS |
| if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) |
| unload_nls(UDF_SB(sb)->s_nls_map); |
| #endif |
| if (!(sb->s_flags & MS_RDONLY)) |
| udf_close_lvid(sb); |
| brelse(UDF_SB_LVIDBH(sb)); |
| UDF_SB_FREE(sb); |
| kfree(sb->s_fs_info); |
| sb->s_fs_info = NULL; |
| } |
| |
| /* |
| * udf_stat_fs |
| * |
| * PURPOSE |
| * Return info about the filesystem. |
| * |
| * DESCRIPTION |
| * Called by sys_statfs() |
| * |
| * HISTORY |
| * July 1, 1997 - Andrew E. Mileski |
| * Written, tested, and released. |
| */ |
| static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct super_block *sb = dentry->d_sb; |
| |
| buf->f_type = UDF_SUPER_MAGIC; |
| buf->f_bsize = sb->s_blocksize; |
| buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb)); |
| buf->f_bfree = udf_count_free(sb); |
| buf->f_bavail = buf->f_bfree; |
| buf->f_files = (UDF_SB_LVIDBH(sb) ? |
| (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + |
| le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree; |
| buf->f_ffree = buf->f_bfree; |
| /* __kernel_fsid_t f_fsid */ |
| buf->f_namelen = UDF_NAME_LEN - 2; |
| |
| return 0; |
| } |
| |
| static unsigned char udf_bitmap_lookup[16] = { |
| 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 |
| }; |
| |
| static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap) |
| { |
| struct buffer_head *bh = NULL; |
| unsigned int accum = 0; |
| int index; |
| int block = 0, newblock; |
| kernel_lb_addr loc; |
| uint32_t bytes; |
| uint8_t value; |
| uint8_t *ptr; |
| uint16_t ident; |
| struct spaceBitmapDesc *bm; |
| |
| lock_kernel(); |
| |
| loc.logicalBlockNum = bitmap->s_extPosition; |
| loc.partitionReferenceNum = UDF_SB_PARTITION(sb); |
| bh = udf_read_ptagged(sb, loc, 0, &ident); |
| |
| if (!bh) { |
| printk(KERN_ERR "udf: udf_count_free failed\n"); |
| goto out; |
| } else if (ident != TAG_IDENT_SBD) { |
| brelse(bh); |
| printk(KERN_ERR "udf: udf_count_free failed\n"); |
| goto out; |
| } |
| |
| bm = (struct spaceBitmapDesc *)bh->b_data; |
| bytes = le32_to_cpu(bm->numOfBytes); |
| index = sizeof(struct spaceBitmapDesc); /* offset in first block only */ |
| ptr = (uint8_t *)bh->b_data; |
| |
| while (bytes > 0) { |
| while ((bytes > 0) && (index < sb->s_blocksize)) { |
| value = ptr[index]; |
| accum += udf_bitmap_lookup[value & 0x0f]; |
| accum += udf_bitmap_lookup[value >> 4]; |
| index++; |
| bytes--; |
| } |
| if (bytes) { |
| brelse(bh); |
| newblock = udf_get_lb_pblock(sb, loc, ++block); |
| bh = udf_tread(sb, newblock); |
| if (!bh) { |
| udf_debug("read failed\n"); |
| goto out; |
| } |
| index = 0; |
| ptr = (uint8_t *)bh->b_data; |
| } |
| } |
| brelse(bh); |
| |
| out: |
| unlock_kernel(); |
| |
| return accum; |
| } |
| |
| static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table) |
| { |
| unsigned int accum = 0; |
| uint32_t elen; |
| kernel_lb_addr eloc; |
| int8_t etype; |
| struct extent_position epos; |
| |
| lock_kernel(); |
| |
| epos.block = UDF_I_LOCATION(table); |
| epos.offset = sizeof(struct unallocSpaceEntry); |
| epos.bh = NULL; |
| |
| while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) |
| accum += (elen >> table->i_sb->s_blocksize_bits); |
| |
| brelse(epos.bh); |
| |
| unlock_kernel(); |
| |
| return accum; |
| } |
| |
| static unsigned int udf_count_free(struct super_block *sb) |
| { |
| unsigned int accum = 0; |
| |
| if (UDF_SB_LVIDBH(sb)) { |
| if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb)) { |
| accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]); |
| if (accum == 0xFFFFFFFF) |
| accum = 0; |
| } |
| } |
| |
| if (accum) |
| return accum; |
| |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) { |
| accum += udf_count_free_bitmap(sb, |
| UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap); |
| } |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) { |
| accum += udf_count_free_bitmap(sb, |
| UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap); |
| } |
| if (accum) |
| return accum; |
| |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) { |
| accum += udf_count_free_table(sb, |
| UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table); |
| } |
| if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) { |
| accum += udf_count_free_table(sb, |
| UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table); |
| } |
| |
| return accum; |
| } |